Filters in Ansible are from Jinja2, and are used to transform data inside a template expression. The templates operate on the Ansible controller, and not on the target host. Therefore, filters execute on the controller as they augment the data locally.
Jinja2 ships with many filters as does Ansible, and also allows users to add their own custom filters.
The IBM z/OS core collection includes filters and their usage in sample playbooks. Unlike collections that can be identified at the top level using the collections keyword, filters must always be specified in the playbook with their fully qualified name even when included in a collection.
Filters usage follows this pattern:
ibm.ibm_zos_core.filter_wtor_messages(‘IEE094D SPECIFY OPERAND’)
For more details on filters, review the filters and documentation under the filter directory included in the collection.